all the refactor

cmd/cart/product-fetcher_integration_test.go

@@ -56,7 +56,7 @@ func newTestPoolServer(t *testing.T) *PoolServer {
 	if err != nil {
 		t.Fatalf("new pool: %v", err)
 	}
-	return NewPoolServer(pool, "test")
+	return NewPoolServer(pool, "test", nil)
 }
 
 // exampleId is the catalog item the fetcher rework was validated against.
@@ -338,7 +338,7 @@ func TestChildren_ParentLinkage(t *testing.T) {
 		Children: []Item{{Sku: exampleId, Quantity: 1, StoreId: &childStore}},
 	}}
 
-	groups := buildItemGroups(ctx, items, "se")
+	groups := buildItemGroups(ctx, items, "se", nil)
 	if len(groups) != 1 {
 		t.Fatalf("groups = %d, want 1", len(groups))
 	}